ls with umbrella head and ring shanks are durable and firmly fixed, especially suitable for tropical areas house buildings. Three reasons of choosing: First, Twist ring shank roofing nails galvanized are used extensively in post fram construction due to their superior performance. The nails have approximately twice the withdrawal resistance of smooth-shank nails of the same diameter. Second, the umbrella head offers bigger strength compared with flat head nails; third, the HDG treatment guarante